Mössbauer study of

Abstract

has been studied by means of Mössbauer spectroscopy and x-ray diffraction. The crystal is found to have a cubic spinel structure with the lattice constant . The iron ions are in ferric states. The temperature dependences of the magnetic hyperfine fields at the nuclei at the tetrahedral (A) and octahedral (B) sites are analysed using the Néel theory of ferrimagnetism. The inter-sublattice superexchange interaction is found to be antiferromagnetic with a strength of while the intra-sublattice superexchange interactions are ferromagnetic with strengths of and . The Debye temperatures of the tetrahedral and octahedral sites are determined to be and , respectively.

Characterization of the Mn–Li ferrite system Li1–0.5xFe1.5x+1Mn1–xO4 (0.2 ≤ x ≤ 1)

“…8 Magnetic order is caused by superexchange interactions, the intra-sublattice interactions being ferromagnetic while the inter-sublattice interactions are antiferromagnetic. [8][9][10][11] Further insertion of Li and Mn yields distinct spinel phases whose cation distribution and properties have been the subject of extensive studies. 2,[12][13][14][15] The use of Li 11x Fe 0.5 Mn 1.5 O 4 as a cathode material in Li-ion batteries has also been tested.…”

The study of superexchange interaction of ordered Li 0.5 Fe 1.0 Rh 1.5 O 4

“…lithium ferrites and lithium gallates have an isostructure of the ordered lithium ferrite, too. The magnetic properties that the intra-sublattice interactions are comparable to inter-sublattice interaction by cation ordering on the Kun Uk Kang · Chul Sung Kim (B) Department of Physics, Kookmin University, Seoul 136-702, Korea e-mail: cskim@phys.kookmin.ac.kr octahedral sites have been reported [5]. The ordering distribution of the tetrahedral site rarely reported in spinel oxides have revealed in thiospiels -Cu 0.5 Fe 0.5 Cr 2 S 4 , Cu 0.5 Fe 0.5 Rh 2 S 4 , etc.…”

Order-disordered structure and magnetic properties of Li0.5Fe2.5−xRhxO4

“…1-4 Many of spinel ferrites are complex spectra of ferrous ions from which it is very difficult to extract information on magnetic interactions, 5 for the magnetic hyperfine field of a ferrous ion is not proportional to the ionic spin, owing to the orbital contribution, and the electric field gradient due to the ferrous ions is usually quite large. 4 In this work, to study magnetic properties of orderdisordered structure in lithium ferrites, we prepared Li 0.5 Fe 2.5−x Rh x O 4 sample. Specially, it has been reported that Li 0.5 Fe 2.5 O 4 has ordered structure below 735°C and disordered structure around 1000°C.…”